Paints Chainer is a web tool that's recently been blowing up on Japanese social media. Don't worry, this isn't some silly new photo editing app you'll use for 5 minutes and get bored of. You're going to want to check this out.
Invented by Japanese mechanical engineer Taiyama, its AI assisted technology automatically colors your black and white drawings for you. You can even give hints about the colors you'd like the tool to use, and - as you can see below - the results are pretty darn impressive.
You can even work with color drawings, and Paints Chainer will fade the colors out and leave you with something you might even like better than the original.
Give it a try yourself by grabbing a picture from google and plugging it into Paints Chainer to see what happens. There goes your productive afternoon.